Need help identifying egg sac or cocoon

Waukesha, WI

Does anyone have a clue what may be in here? It's large about the size of a marshmellow. It;s squishy, not hard. It came out of a tree. During the last storm a branch came down and this was attached to it. My kids have it in a bug catcher and are waiting for it to hatch.

Thumbnail by hollieben
Minot, ND

Looks like a cocoon of one of the giant silk moths in the family Saturniidae.

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